Rubbing machine



April 12, 1938. 0, A, KEHLE 2,113,694

RUBBING MACHINE INVENTOR. Orr/wm? f7. /ff/Mf.

F n u f 3' i?? g April 12, 1938. Q A KEHLE 2,113,694

' RUBBING MACHINE Filed April 8, 1936 3 Sheets-Sheet 2 H IINVENTOR.

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\ ATTORNE April 12, 1938 o. A. KEHLE 2,113,694

RUBBING MACHINE Filed April 8, 1936 3 Sheets-Sheet 3 INVENTOK OTT/76W /7 mfr/z. f.

BY www@ l ATTO hanged Apr. 12, 193s UNITED .STATES 2,113,694 noname. MACHINE Ottmar A. Kehic, netr1t, Mich., assignmto smling Products Company, Detroit, Mich., a corporation of California Application April s, 193s, serial No. 73,284

7 Claims.

My invention relates to a new and useful improvement in a rubbing machine and has for its object the provision of a machine used for sanding, polishing, burnishing, and such other operations in which a movable contact member is moved over a surface for rubbing purposes either to remove projections and depressions or to produce a smooth surface, produce a finish, or the I like. Another object of the present invention is t provide a device of this class which will be simple in structure, economical of manufacture, durable and highly eflicient in use.

Another object of the invention is the provision in a rubbing machine of a contact member associated with a reciprocating mechanism and mounted in floating relation thereto, so as to be unattached relatively tothe same.

Another object of the invention is the provision in a rubbing machine of this kind of a contact member which may be reciprocated or moved relatively to the moving mechanism and maintained during its moving operations in a fiat condition so that-the rubbing or contacting member is not distorted out of its normal plane.

Another object of the invention is the provision in a rubbing machine of this class of.' a contact member associated withv mechanism for reciprocating it and provided with retaining members which may roll during the reciprocation.

Another object of the invention is the provision in a rubbing machineof a contact member having a securing member attached thereto whereby an abrasive sheet or the like may be easily and quickly secured in position.

Another object of the invention is the provision in a machine of this class of a dust shield so constructed and arranged as to effectively shield the various working parts from dust or other foreign material.

Another object of the invention is the provision in a machine of this class of an eccentric arm adapted for effecting reciprocation of the contact -memben Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by a reference to the accompanying drawings which form a part of this specification, and in which,

Fig. 1 is a central, longitudinal, vertical, sectional view of the invention.

FiFig. 2 is a sectional View taken on line 2-2 ofv g. 1.y FiFigl. 3 is a sectional view taken on line 3-3 of Fig. 4 is a fragmentary, central, sectional View through the motor housing showing a slightly modified form.

Fig. 5 is a longitudinal, central, vertical, sectional view of a modified form of the invention.

Fig'. 6 is a sectional view taken on line 6-6 of Fig. 5.

Fig. 7 is a fragmentary, sectional view taken on line 1-1 of Fig. 6.

Fig. 8 is a plan view of a retainer used in th invention.

9.* is a sectional view taken on line 9--9 of In the form shown in Fig. 1 I have indicated the device used with an elongated housing I5 projecting upwardly from one end of which is a motor housing I6. Mountedvin this motor housing is. an electric motor I1 having the shaft I8 journalled in the bearings I9 and 20 and provided at one end with the pulley 2| which is xedly attached thereto and connected by means of the belt 22 to the pulley 23 which is mounted on the shaft 24 journalled'in the bearings 25 and 26. Fixedly mounted at one end on the shaft 24 is the eccentric arm 21 projecting outwardly from one face of which is the stud 28 projecting into the bearing comprising the ring 29 and the bearings 30. Embracing this ring 29 is the eccentric band 3| secured to one end of the eccentric arm 32. The opposite end embraces the bushing 33 which is mounted on the threaded stud 34 projecting upwardly from the tubular member 35 provided, intermediate its ends, with the flange 36 by means of which it is secured to the plate 31. This plate 31 is slidably mounted and overiies the opening 38 formed in the` bottom 39 of the housing I5. Projecting outwardly from the bottom 39 is a boss 40 of the same thickness as the spacing member 4 I. Engaging the outer face of the boss 40 and the spacing member 4I is a guide plate 42 provided at opposite sides with the depending flanges 43Y and 44. The plate 42 is secured in position by screws 45 and is also provided with a central opening 46 substantially registering with the opening 38.

Used withthis mechanism is an operating shoe embodying the plate-like member 41 which is preferably formed from rubber or other similar material and in which is anchored the cupshaped bushing 48 having at its lower closed end the peripheral ange 49 serving as an anchor.

This member 48 is embraced by a sleeve 50 formed preferably from the same material as the body 41. Snugly engaging in the member 48 is the tubular member 35 and engaging in the tubular member 35 is a spring 5I, one end of which engages the closed end of the tubular member 35- and the other end of which engages the closed end. of the member 48. Secured by wire 52 around the flange 53 which is pressed downwardly from the guide member 42 around the opening 46 formed therein, is one end of a flexible sleeve or shield 54 and the other end of which is secured in embracing relation by means of the wire 55 on the sleeve 50, so that the entry of dust or foreign material into the tube 35 or the member 48 will be prevented.

A layer 59 of sand paper, emery cloth, or similar abrasive material is used with the device and is folded upwardly so as to overlie the groove 60 formed in the body 41. Engaging in this groove are contact strips 6| of a semi-rigid structure and connected by means of the hooks 62 and 63 and the spring 64. A layer 65 of yieldable material, such as felt or the like, is gluedor otherwise supported on the undersurface of the body 41.

Secured 4by the bolts 66 to the body 41 are the annular hangers 61 which are formed from flexible material, preferably rubber or the like, and which may constitute merely rings or which may be cylindrical tubes. These hangers 61 engage the undersurface of the plate 42 and extended through the flanges 43 and 44 of the plate 42 are rods 68, through the opposite ends of which are projected the cotter pin 69. Thus the shoe is freely mounted on the plate 42 in a free floating condition and the annular members 61, not being fixed at any definite point to the plate 42, are free to rotate on their own axis relatively to the plate 42 and the shoe 41. It is obvious that the shoe embodying the member 41 and the attached parts may move relatively to the plate 42 while remaining in a plane parallel thereto. 'I'his is due to the fact that the hangers 61 are easily distorte-d and compressed into various shapes.

In operation when the motor I1 is running, the pulley 23 will effect through the eccentric action on the eccentric arm 32, a reciprocation of the member 35. This member 35 will, of course, carry with it the slide plate 31 which will slide in the space 10 between the bottom 39 and the plate 42. Through the engagement of the member 35 in the tubular member 48, a reciprocation of the shoe will be effected and the shoe in the reciprocation will not be bent or distorted out of form but will remain in a plane parallel to the plate 42. The pulley 23 will serve as a fly wheel in this operation and a quiet and silently operated machine will thus be provided. Also, on account of the use of the hangers 61, a pressure exerted upon the shoe will be a yielding one and a maximum travel of the shoe may thus be effected while still maintaining it parallel to the plane of the plate 42.

In the housing I6 I have provided a water jacket for cooling of the motor by forming the chamber 1| into which communicates the water delivery pipe 12. The water from the water delivery pipe may pass through the passages 13 and be deposited upon the work piece operated upon so that a wet sanding'operation may thus be obtained when desired.

As shown in Fig. 3, studs 14 project downwardly from the plate 42 and extend through the annular hangers 61 so as to prevent longitudinal displacement of the shoe relative to the plate 42,

although, if desired, the -studs 14 may be dispensed with. y

In Fig. 5 and Fig. 6 I have shown a modified form of the construction in which a housing 15 is provided, mounted on a suitable base 16. Projecting laterally from the housing 15 is a threaded neck 11 in which is threaded a bushing 18 carrying the bearings 19 and 80 in which is journalled a shaft 8| on which is mounted the spacing bushing 82. Threaded into the bushing 18 is a fitting 83 threaded into which is a gland 84 attached to a sheathing 85 of a flexible shaft 66. This shaft 86 is projected into the shaft 8| and serves to drive the same. Formed on the shaft 8| is the enlarged portion 81 carrying the Areduced portion 88 on which is mounted the eccentric disk 88, projecting outwardly from the face of lwhich is the stud which extends through the bearing 8| which is embraced by the eccentric strap 82 carried by the eccentric arm 93. A nut 94 and a cotter pin 95 serve to secure the bearing in position on the stud 90. The eccentric arm at its opposite end engages between the bifurcations 96 and 81 formed on the upper end of the stud or drive pin 98 which is projected upwardly through the opening 99 formed in a slide plate IOI. Engaging the bottom of this slide plate is the flange |02 formed on the drive pin 58 and a nut |08 is threaded on the drive pin to securely clamp the slide plate IOI against the flange I 02. This slide plate is positioned in the space 10 which lies between the bottom 16 and the guide plate 42'. This guide plate 42 is provided with the depending flanges 43 and 44'. The plate 42' is secured to the base 16 and the housing 15 by means of the screws 45. Formed in the plate 42' is an opening 46' substantially registering with the opening 38' formed in the bottom 16. Secured to the flanged portion ofthe plate 42 is a flexible shield 54' having the body 55' and the neck 56 which embraces the tubular portion 35' of the drive pin. 'I'his tubular portion ergages in the bushing 48 which is provided with the flange 48 and embedded in the body 41 and encircled by the portion 50. In this form it will be noted that the spring 5| in Fig. l is dispensed with `and a pin |04 is projected through slots I 05 and |06 formed in the members 48 and 50 and through a passage formed in the tubular portion 35. The hangers 61 are secured by the bolts 66 in the manner described for Fig. l but the rods or pins 68 and the cotterv pin 68 are eliminated and extending into each of the hangers is a stud 14. These studs 14 prevent lateral movement of the hangers 61 and the use of the studs 14 is optional as the device will function with or without these studs. The body 41 is provided with the groove 60 in which engages a rubber frame |01 to secure the layer 53 in position, this layer engaging the layer of felt 65 which is secured to the bottom of the body 41. Thev the pin 98 will be effected to effect a reciprocation of the shoe. In this form, however, it will be noted that there is no means provided for conducting water to the shoe so that a dry operation would be effected. Aside from this, however, all of the advantages referred to in Fig. 1 may be attained.

In Fig. 4 I have illustrated a slightly modified form of housing I6 which may be used in any device embodying the structure Shown in. Fig. 1. In the form shown in Fig. 4 the water delivery pipe 12 is dispensed with and the housing I6 is provided with the space I 88 opening at the top .andjaway from the housing which may be termed into the interior ill oi' the dome III which has y an opening lil formed/therein. Thespace l opens through the passages ii! so that air may be discharged downwardly of the operating shoe. Positioned within the chamber III of the dome III and iixedly mounted upon the shaft Il of the motor is a fan H3 which will serve to draw the air downwardly and force yit to travel in the direction indicated by the arrows in Fig. 4, so as to effect a cooling of the motor.

In Fig. 8 I have indicated a view of a retainer which may be used instead of the contact strip, the hooks 62 and and the spring M shown in Fig. 1.' This retainer strip is formed in the shape of a closed frame embodying the oppositely disposed end strips |l| and |62 and the side strips |63 and IM. This frame is preferably molded and formed from semi-stil! rubber so that it is ilexible, while at the same time the end strips IGI and III are rigid in a direction transversely of their width while the same may be flexed in the other direction. This retainerV strip is adapted for mounting on the shoe with the end strips and |82 engaging with the grooves il to retain the abrasive strip |69 in position. In use, it has been demonstrated that theedge of the abrasive will some times wear or cut through the retaining frame when formed oi rubber or a similar material. To avoid this, the corners of the frame are re-enforced by metallic clips |65 having at the opposite ends the spaced lugs |66, the clip itself being formed trough -shaped so as to embrace the end and side strips of the frame.

This form of retainer reduces the presence of metallic parts over what is shown in the retainer illustrated in Fig. 1 and thus the possibility of scratching or marring a finished surface is reduced to a minimum. 'Ihe strips |6| and |62, being ilexible in one direction and comparatively rigid in the opposite direction, affords a. stiff connection and at the same time presents the desired flexibility necessary in a device of this class.

In the retainer shown in Fig. l a flexible and yet semi-rigid retaining frame is provided and the use of the hooks 62 and 63 aifords the necessary freedom of movement necessitated by the vibration inherent in the device when in operation. f

The shoe beingformed of a molded material, such as rubber or the like, provides a body which is semi-rigid, that is it is rigid and stiff except when it is subjected to considerable pressure. Under pressure, the shoe will, of course, bend and flex so that when used on surfaces other than plane surfaces, the shoe will follow .the various curves and depressions because of its flexibility. At the same time, because of its rigidity and tendency to return to a normal planal state or condition, the shoe is adapted for resisting such pressure as may be transmitted thereto in normal operation. The shoe, therefore, on account of its construction, is of a rigid and yet of a exible or elastic type. Being molded, it lends itself to the mounting of the members 40 -in position without, in any manner, interfering with its characteristics of ilexibility and rigidity.

`With a rubbing machine constructed vas described in the forms illustrated, an economical, durable and` highly emcient machine is provided, possessing a minimum amount of vibration and obtaining the objects and advantages enumerated herein.

It will be noted that in both forms the hangers 61 are so arranged that the shoe may move toward i a supporting body for the actuating or reciprocating mechanism. The shoe will also be capable of movement longitudinally of itslength relatively to this supporting body but a lateral tilting oi' the shoe relatively to the supporting body will be resisted because the annular members are sufiiciently wide'and substantial to resist such a lateral tilting movement. Consequently, the shoe will, in its movements, be always maintained laterally in alignment with the guide plate beneath which it ismounted or in. alignment with the supporting body beneath which it is mounted. The hangers, while flexible, are sufllciently rigid to resist distortion until a certain power of distorting force is reached. These hangers, may, therefore, be said to be flexible and semi-rigid.

WhileI have illustrated the preferred forms of construction, I do not wish to limit myself other than as such limits are set forth in the claims attached hereto.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A rubbing machine of the class described, comprising: a shoe; mechanism for reciprocating said shoe; a supporting body for said mechanism; a plurality of annular flexible members positioned between said shoe and said supporting body for spacing said shoe therefrom and con-l necting said shoe loosely thereto. the periphery of said annular members engaging, at diametrically opposite points, said supporting body and said shoe. a

2. A rubbing machine of the class described, comprising: a shoe; a mechanism for reciprocating said shoe; a supporting body for said mechanism; a plurality of annular flexible members positioned between said body and said shoe and engaging said body ,and said shoe and spacing the same apart; means for securely connecting said annular members to said shoe; and means for loosely connecting said annular members to said body for free movement relatively thereto excepting laterally. i

3. A rubbing machine of the class described, comprising: a shoe; a mechanism for reciprocating said shoe; a supporting body for said mechanism; a plurality of annular flexible members positioned between said body and said shoe and engaging, at diametrically opposite points on their peripheries, said body and said vshoe' and spacing the same apart; and means for securely connecting said annular members to said shoe.

4. A rubbing machine of the class described, comprising: a shoe; means for reciprocating said shoe; a supporting body for said reciprocating means; flexible annular members positioned between said shoe and said supporting body Afor f engaging said shoe and said supporting body; means for connecting said annular members to said shoe; and a rod carried by said supporting j parallel to the planes of said body and said shoe;

and means Ior ioatingly connecting said shoe to said supporting body.

comprising a shoe; a mechanism for reciprocating said shoe; a supporting body for said mech- Said body.

anism; a plurality'of annular exible members positioned between said body and said shoe and engageable with said body and said shoe and spacing the same apart, the axes oi said annular members extending transversely of and between the planes of said supporting body and said shoe; means for connecting said annular members to said shoe; and means .for connecting said annular members to said body, said annular members being rockable longitudinally of said body on said last-named connecting means as an axis, saidconnecting means preventing lateral movement of said annular members relatively to O'I'IMAR A. KEHLE. 

